June 24, 2010 11:00 AM

Meet rocker and TV host Mark McGrath’s biggest hits: His fiancée Carin Kingsland and their eight-week-old twins, Lydon Edward and Hartley Grace.

“She’s so precious, just a princess. And he’s my little dude,” says the Sugar Ray singer of his children, who arrived on April 29. “Their birth was the greatest moment of my life.”

The twins are “polar opposites” in personality and looks, says the couple. While Lydon “knows what he wants and wants it now,” says Kingsland, Hartley “is very calm and has a lot of patience. She’s very sweet.”

Adds McGrath, who will host the new season of Don’t Forget the Lyrics! this fall: “People say Lydon looks like me, and Hartley has a Latin flavor to her – she’s got darker skin and big beautiful lips like Carin.” The couple plans to raise the twins to speak English and Spanish like Kingsland, whose mother is from Panama.

After 16 years of dating ups and downs, McGrath, 42, and Kingsland, 37, hoped to start a family after a solid four-year run in their relationship. But their path to parenthood wasn’t easy, especially as they got older.

Kingsland had lost one ovary to a tumor at age 11 and suffered from fibroids and polycystic ovary syndrome. And McGrath had been told he might never father children following a childhood case of torsion (a twisted testicle).

So after more than a year of failing to conceive the old-fashioned way, they decided to try a single round of IVF and were surprised not only when it worked – but when they learned they were expecting two bundles of joy.

“Not to be cheesy, but you get really gangster about your relationship now, like this is my family,” says McGrath. “There’s a bond that the four of us share that nobody can mess with.”

For more on McGrath and Kingsland’s journey to parenthood, check out the new issue of PEOPLE, on newsstands Friday

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